public class code059 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		int sum = 0;
		for (int i = 10; i <= 20; i++) {
			if (i % 2 != 0)
				continue;
			sum = sum + i;
		}
		System.out.println(sum);

	}

}
